Lesser included offence

In criminal law, a lesser included offense is a crime for which all of the elements necessary to impose liability are also elements found in a more serious crime. It is also used in non-criminal violations of law, such as certain classes of traffic offenses.

For example, the common law crime of larceny requires the taking and carrying away of tangible property from another person, with the intent of permanently depriving the owner of that property. Robbery, under the common law, requires all of the same elements, plus the use of force or intimidation to accomplish the taking. Therefore, larceny is a lesser included offense in the offense of robbery, as every robbery includes a larcenous act as part of the crime. Assault is also a lesser included offense of robbery, just as false imprisonment is usually a lesser included offense of kidnapping. However, an offense will not be a lesser included offense if it carries a maximum penalty greater than that carried by the charged offense.

In the case of traffic offenses, serious misconduct while operating a motor vehicle can result in a charge of reckless driving, which could, in egregious cases, be punishable as a misdemeanor either by imprisonment, a fine, or both. However, if the person charged proves to the court that their actions were not serious enough as to constitute recklessness, the offense may in some jurisdictions qualify as being the lesser-included offense of improper driving, which is not a criminal offense and is only punishable by a fine.

Under the merger doctrine as this term is used in criminal law, lesser included offenses generally merge into the greater offense. Therefore, a person who commits a robbery cannot be convicted of both the robbery and the larceny that was part of it. In Canadian law, the leading case on this principle is R. v. Kienapple and the principle is therefore commonly called the Kienapple principle.

Solicitation to commit a crime and attempt to commit a crime, although not strictly speaking lesser included offenses, merge into the completed crime. As an important exception, the crime of conspiracy does not merge into the completed crime.

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